org.apache.lucene.search.comparators

Class DoubleComparator.DoubleLeafComparator

java.lang.Object

org.apache.lucene.search.comparators.NumericComparator.NumericLeafComparator

org.apache.lucene.search.comparators.DoubleComparator.DoubleLeafComparator

All Implemented Interfaces:

LeafFieldComparator

Enclosing class:

DoubleComparator

public class DoubleComparator.DoubleLeafComparator
extends NumericComparator.NumericLeafComparator

Leaf comparator for DoubleComparator that provides skipping functionality

Field Summary

Fields inherited from class org.apache.lucene.search.comparators.NumericComparator.NumericLeafComparator

docValues

Constructor Summary

Constructors

Constructor and Description
DoubleLeafComparator(LeafReaderContext context)

Method Summary

Modifier and Type	Method and Description
int	compareBottom(int doc) Compare the bottom of the queue with this doc.
int	compareTop(int doc) Compare the top value with this doc.
void	copy(int slot, int doc) This method is called when a new hit is competitive.
protected void	encodeBottom(byte[] packedValue)
protected void	encodeTop(byte[] packedValue)
protected boolean	isMissingValueCompetitive()
void	setBottom(int slot) Set the bottom slot, ie the "weakest" (sorted last) entry in the queue.

Methods inherited from class org.apache.lucene.search.comparators.NumericComparator.NumericLeafComparator

competitiveIterator, getNumericDocValues, setHitsThresholdReached, setScorer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DoubleLeafComparator

public DoubleLeafComparator(LeafReaderContext context)
                     throws IOException

Throws:

IOException

Method Detail

setBottom

public void setBottom(int slot)
               throws IOException

Description copied from interface: LeafFieldComparator

Set the bottom slot, ie the "weakest" (sorted last) entry in the queue. When LeafFieldComparator.compareBottom(int) is called, you should compare against this slot. This will always be called before LeafFieldComparator.compareBottom(int).

Specified by:

setBottom in interface LeafFieldComparator

Overrides:

setBottom in class NumericComparator.NumericLeafComparator

Parameters:

slot - the currently weakest (sorted last) slot in the queue

Throws:

IOException

compareBottom

public int compareBottom(int doc)
                  throws IOException

Description copied from interface: LeafFieldComparator

Compare the bottom of the queue with this doc. This will only invoked after setBottom has been called. This should return the same result as FieldComparator.compare(int,int)} as if bottom were slot1 and the new document were slot 2.

For a search that hits many results, this method will be the hotspot (invoked by far the most frequently).

Parameters:

doc - that was hit

Returns:

any N < 0 if the doc's value is sorted after the bottom entry (not competitive), any N > 0 if the doc's value is sorted before the bottom entry and 0 if they are equal.

Throws:

IOException

compareTop

public int compareTop(int doc)
               throws IOException

Description copied from interface: LeafFieldComparator

Compare the top value with this doc. This will only invoked after setTopValue has been called. This should return the same result as FieldComparator.compare(int,int)} as if topValue were slot1 and the new document were slot 2. This is only called for searches that use searchAfter (deep paging).

Parameters:

doc - that was hit

Returns:

any N < 0 if the doc's value is sorted after the top entry (not competitive), any N > 0 if the doc's value is sorted before the top entry and 0 if they are equal.

Throws:

IOException

copy

public void copy(int slot,
                 int doc)
          throws IOException

Description copied from interface: LeafFieldComparator

This method is called when a new hit is competitive. You should copy any state associated with this document that will be required for future comparisons, into the specified slot.

Specified by:

copy in interface LeafFieldComparator

Overrides:

copy in class NumericComparator.NumericLeafComparator

Parameters:

slot - which slot to copy the hit to

doc - docID relative to current reader

Throws:

IOException

isMissingValueCompetitive

protected boolean isMissingValueCompetitive()

Specified by:

isMissingValueCompetitive in class NumericComparator.NumericLeafComparator

encodeBottom

protected void encodeBottom(byte[] packedValue)

Specified by:

encodeBottom in class NumericComparator.NumericLeafComparator

encodeTop

protected void encodeTop(byte[] packedValue)

Specified by:

encodeTop in class NumericComparator.NumericLeafComparator